Design of C_f/SiC_f/Si₃N_4f multifiber layered composite with enhanced electromagnetic wave absorption properties.

Traditional fiber‐reinforced composites with single‐layered electrical conductivity (EC) face limitations with respect to electromagnetic wave absorption (EWA) bandwidth and strength. This study introduces a novel Cf/SiCf/Si3N4f layered composite (multifiber layered composite, MFLC), prepared via fiber alignment and curing, which capitalizes on the distinct ECs of carbon fibers (Cf), silicon carbide fibers (SiCf), and silicon nitride fibers (Si3N4f) to address these limitations. The Si3N4f layer enhances the impedance matching, deepening EW penetration and curtailing reflection. The conductive Cf and SiCf layers lead to substantial energy dissipation through conduction loss. Electric field simulations confirmed the regulatory effect of Si3N4f layer on EC, thereby facilitating the optimization of impedance matching. MFLCs achieved a minimum reflection loss of −68.52 dB and an effective absorption bandwidth of 8.23 GHz in the X–Ku band. The optimally matched composites demonstrated exceptional EWA performance, attaining the radar cross section reduction of up to 149.9%. The MFLCs hold significant promise as a novel class of lightweight, highly efficient, and wide‐bandwidth EW absorbers. [ABSTRACT FROM AUTHOR]